Apple Color 1.5 - Manual (Page 190)

The Parade scope makes it easy to spot color casts in the highlights and shadows of an
image, by comparing the contours of the top and the bottom of each waveform. Since
whites, grays, and blacks are characterized by exactly equal amounts of red, green, and
blue, neutral areas of the picture should display three waveforms of roughly equal height
in the Parade scope. If not, the correction is easy to make by making adjustments to level
the three waveforms.
Before color correction
After color correction
190 Chapter 8 Analyzing Signals Using the Video Scopes